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