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