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