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