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