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