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