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