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