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