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