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