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