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