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