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