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