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