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