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