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