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