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