One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,15)(8,12)(9,14)(10,13)(11,17)(16,20)(18,19)(21,22)(23,28)(24,30)(25,31)(26,29)(27,32)(33,36)(34,35) involution — undirected(1,2)(3,4)(5,7)(6,11)(8,16)(9,18)(10,17)(12,19)(13,15)(14,20)(21,23,27,33)(22,28,32,36)(24,26,34,25)(29,35,31,30)(2,4)(5,8,10,9)(6,12,13,14)(7,16,17,18)(11,19,15,20)(22,29)(23,33)(25,26)(28,30)(31,32)(35,36)(6,13)(11,15)(12,14)(19,20)(21,24,27,34)(22,30,32,35)(23,25,33,26)(28,31,36,29)(2,4)(5,9,10,8)(6,14,13,12)(7,16,17,18)(11,19,15,20)(21,25,27,26)(22,31,32,29)(23,34,33,24)(28,35,36,30)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.