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