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