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