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