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