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