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