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