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