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