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)(21,22,27,24)(23,30,25,28)(26,32,34,29)(31,35,33,36)(6,12)(7,9)(14,18)(15,17)(21,22,27,24)(23,28,25,30)(26,29,34,32)(31,35,33,36)(5,7,11,9)(6,13,12,8)(10,15,19,17)(14,20,18,16)(21,23,27,25)(22,28,24,30)(26,31,34,33)(29,35,32,36)(5,8,11,13)(6,7,12,9)(10,16,19,20)(14,15,18,17)(21,24,27,22)(23,28,25,30)(26,32,34,29)(31,35,33,36)(1,3,4,2)(5,9,11,7)(6,13,12,8)(10,17,19,15)(14,20,18,16)(21,25,27,23)(22,28,24,30)(26,33,34,31)(29,35,32,36)(5,10,11,19)(6,14,12,18)(7,15,9,17)(8,16,13,20)(21,26)(22,29)(23,31)(24,32)(25,33)(27,34)(28,35)(30,36)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.