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