One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,8)(3,9,4,5)(6,10,15,16)(11,14,12,13)(17,18,23,28)(19,22,27,24)(20,25,30,32)(21,31,29,26)(33,34,38,41)(35,39,42,46)(36,37,40,45)(43,44,47,48)(2,8)(3,4)(10,16)(11,12)(17,19)(18,24)(20,29)(21,30)(22,28)(23,27)(25,31)(26,32)(35,42)(39,46)(43,47)(44,48) involution — undirected(1,3,7,4)(2,5,8,9)(6,11,15,12)(10,13,16,14)(17,20,23,30)(18,25,28,32)(19,29,27,21)(22,26,24,31)(33,35)(34,39)(36,43)(37,44)(38,42)(40,47)(41,46)(45,48)(1,4,7,3)(2,9,8,5)(6,12,15,11)(10,14,16,13)(17,21,23,29)(18,26,28,31)(19,30,27,20)(22,25,24,32)(1,5,7,9)(2,3,8,4)(6,14,15,13)(10,12,16,11)(17,19)(18,22)(20,29)(21,30)(23,27)(24,28)(25,26)(31,32)(33,36)(34,37)(35,43)(38,40)(39,44)(41,45)(42,47)(46,48)(1,6,7,15)(2,10,8,16)(3,11,4,12)(5,13,9,14)(17,22)(18,27)(19,28)(20,26)(21,25)(23,24)(29,32)(30,31)(33,37)(34,40)(35,44)(36,41)(38,45)(39,47)(42,48)(43,46)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.