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