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