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