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