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