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