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