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