One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,23,25,22,20,21,26)(19,27,28,31,30,24,29,32)(2,5)(6,8)(9,10)(11,15)(12,14)(13,16)(17,19)(18,24)(20,27)(21,29)(22,30)(23,28)(25,32)(26,31) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,20,22,18)(19,27,30,24)(21,26,23,25)(28,32,29,31)(11,16)(13,15)(17,21,22,23)(18,25,20,26)(19,28,30,29)(24,31,27,32)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,21,22,23)(18,25,20,26)(19,29,30,28)(24,32,27,31)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.