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