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