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