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