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