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