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