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