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)(19,28,29,32)(20,26,24,31)(21,27,22,30)(9,10)(11,15)(12,13)(14,16)(17,19,21,31,23,29,22,26)(18,24,30,32,25,20,27,28)(2,5)(6,8)(10,13)(14,15)(18,25)(19,29)(26,31)(27,30) involution — undirected(9,11,12,16)(10,14,13,15)(17,20)(18,26)(19,30)(21,28)(22,32)(23,24)(25,31)(27,29)(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,27,25,30)(19,31,29,26)(20,32,24,28)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.