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