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