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