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)(23,29)(24,32)(27,31)(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)(21,22,25,26)(23,29,31,27)(24,33,32,28)(30,35,34,36)(2,4)(21,23,26,29,25,31,22,27)(24,34,33,35,32,30,28,36)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(21,24)(22,28)(23,30)(25,32)(26,33)(27,35)(29,36)(31,34)(2,4)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(24,32)(28,33)(30,34)(35,36)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.