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