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