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