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