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