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