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)(19,20)(21,26)(22,25)(23,28)(24,27)(29,32)(30,31) involution — undirected(1,2,7,13,5,9,4,6)(3,8,14,16,10,15,11,12)(17,19,24,30,23,29,21,22)(18,25,26,32,28,31,27,20)(1,3)(2,8)(4,11)(5,10)(6,12)(7,14)(9,15)(13,16)(17,20,19,18,24,25,30,26,23,32,29,28,21,31,22,27)(3,10)(8,15)(11,14)(12,16)(17,21,23,24)(18,26,28,27)(19,22,29,30)(20,25,32,31)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.