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