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