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) involution — undirected(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,22,26,30)(23,31,24,33)(25,35,36,29)(27,34,28,32)(1,2,3,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,23,26,24)(22,27,30,28)(25,34,36,32)(29,33,35,31)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(23,24)(27,28)(31,33)(32,34)(7,17)(11,14)(15,16)(19,20)(21,24,26,23)(22,28,30,27)(25,32,36,34)(29,31,35,33)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.