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