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