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