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