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