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