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