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