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