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