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