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