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