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