One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,8)(3,5,4,9)(6,14,15,10)(11,16,12,13)(17,18,23,26)(19,24,28,22)(20,29,21,25)(27,32,30,31)(33,34,38,41)(35,39,45,48)(36,40,46,37)(42,43,44,47)(2,8)(5,9)(10,14)(13,16)(17,19)(18,24)(20,30)(21,27)(22,26)(23,28)(25,32)(29,31)(33,35)(34,39)(36,44)(37,43)(38,45)(40,47)(41,48)(42,46) involution — undirected(1,3,7,4)(2,9,8,5)(6,12,15,11)(10,13,14,16)(17,20,23,21)(18,25,26,29)(19,27,28,30)(22,32,24,31)(33,36,38,46)(34,40,41,37)(35,42,45,44)(39,43,48,47)(1,4,7,3)(2,5,8,9)(6,12,15,11)(10,13,14,16)(17,21,23,20)(18,25,26,29)(19,27,28,30)(22,31,24,32)(33,37)(34,36)(35,43)(38,40)(39,44)(41,46)(42,48)(45,47)(1,5)(2,4)(3,8)(6,13)(7,9)(10,12)(11,14)(15,16)(17,22)(18,19)(20,31)(21,32)(23,24)(25,30)(26,28)(27,29)(33,36)(34,40)(35,44)(37,41)(38,46)(39,47)(42,45)(43,48) involution — undirected(1,6,7,15)(2,10,8,14)(3,11,4,12)(5,13,9,16)(17,19)(18,22)(20,30)(21,27)(23,28)(24,26)(25,31)(29,32)(33,35)(34,39)(36,44)(37,43)(38,45)(40,47)(41,48)(42,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.