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