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