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