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