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