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