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