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