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