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