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