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)(11,13)(12,14)(15,16)(17,18,21,23)(19,27,28,43)(20,32,34,25)(22,36,29,26)(24,38,37,31)(30,45,33,42)(35,41,44,47)(39,46,40,48)(1,2)(3,6)(4,8)(5,7)(9,11)(10,13)(12,15)(14,16)(18,23)(19,28)(25,32)(26,36)(30,33)(31,38)(41,47)(46,48) involution — undirected(10,14)(11,15)(17,19,29,38,21,28,22,31)(18,24,36,43,23,37,26,27)(20,33,44,46,34,30,35,48)(25,40,47,42,32,39,41,45)(1,3,5,4)(2,6,7,8)(17,20)(18,25)(19,30)(21,34)(22,35)(23,32)(24,39)(26,41)(27,42)(28,33)(29,44)(31,46)(36,47)(37,40)(38,48)(43,45)(1,4,5,3)(2,6,7,8)(11,15)(13,16)(20,34)(25,32)(30,33)(35,44)(39,40)(41,47)(42,45)(46,48)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.