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