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