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