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