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