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