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