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