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