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