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