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