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