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