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