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