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