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