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