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