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