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)(11,13)(12,14)(15,16)(17,18)(19,26)(20,25)(21,27)(22,37)(23,29)(24,28)(30,42)(31,40)(32,39)(33,41)(34,48)(35,46)(36,45)(38,44)(43,47) involution — undirected(1,3,5,4)(2,6,8,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,25)(20,23)(21,34)(22,31)(24,33)(26,29)(27,43)(28,40)(30,35)(32,38)(36,47)(37,41)(39,46)(42,44)(45,48)(1,3,5,4)(2,7,8,6)(10,14)(11,15)(17,20,23,19)(18,26,29,25)(21,32,36,30)(22,31,24,33)(27,42,45,39)(28,40,37,41)(34,35,47,38)(43,46,48,44)(10,14)(13,16)(17,21,24,35,23,36,22,38)(18,27,28,46,29,45,37,44)(19,30,31,34,20,32,33,47)(25,39,41,43,26,42,40,48)(1,4,5,3)(2,7,8,6)(17,22,23,24)(18,28,29,37)(19,31,20,33)(21,35,36,38)(25,40,26,41)(27,44,45,46)(30,47,32,34)(39,43,42,48)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.