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